Title:
HOT-STRETCH-REDUCED ELECTRIC RESISTANCE WELDED PIPE
Document Type and Number:
WIPO Patent Application WO/2022/215548
Kind Code:
A1
Abstract:
This hot-stretch-reduced electric resistance welded pipe has a base metal part and a weld part, the base metal part having a prescribed chemical composition, the value of Ti/N obtained by dividing the Ti content by the N content being 3.0 or greater, the microstructure of the weld part being such that the average grain diameter thereof is 10.0 µm or less, the area ratio of ferrite is 20% or greater, and the remaining structure includes at least one of pearlite and bainite/martensite, the aggregate structure of the weld part being such that the degree of integration of the [0001] plane is 6.0 or less, and the critical cooling rate Vc90 of the base metal part being 5-90°C/s.
Inventors:
TASHIMA KENZO (JP)
NAGAI KENSUKE (JP)
YOKOI TATSUO (JP)
HAMAISHI MITSUHIRO (JP)
TSUSUE TAKASHI (JP)
NAGAI KENSUKE (JP)
YOKOI TATSUO (JP)
HAMAISHI MITSUHIRO (JP)
TSUSUE TAKASHI (JP)
Application Number:
PCT/JP2022/014175
Publication Date:
October 13, 2022
Filing Date:
March 24, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D8/10; C21D9/08; C21D9/50; C22C38/00; C22C38/58
Foreign References:
| JP2001355036A | 2001-12-25 | |||
| JP2006118050A | 2006-05-11 | |||
| JP2010189758A | 2010-09-02 | |||
| JP2012177154A | 2012-09-13 | |||
| JP2021065833A | 2021-04-30 | |||
| JP2002020841A | 2002-01-23 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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